Civil Engineering Reference
In-Depth Information
Traveler
Information Systems
—
provide travelers with real-time accurate
information on roadway traf
c congestion and advice on alternative routes if any
are available. Real time traf
c information reduces trip delays and increases
mobility. Various types of traveler information are available in US cities. They
include:
traveler information numbers, on-route
Dynamic Message Signs (DMS) posting expected travel time, and through
private providers such as NavTeq/Traf
traf
c radio reports,
“
511
”
c.com and INRIX. The increasing
popularity of
“
smart phones
”
provides extensive access to real
time traf
c
information
—
generally for a fee.
Roadside Electronic Screening/Clearance Programs for Commercial Vehicles:
These actions enable credentialed motor carriers to bypass weigh stations. This
reduces the volume of trucks at weigh stations and the delay time while being
processed in addition to the time spent in queues waiting to be processed. It also
can eliminate queues upstream of weigh stations that create mainline congestion
and safety hazards.
project
was expected to prescreen 7.2 million trucks between 2002 and 2012, and save
360,000 h and $25 million to the trucking industry [
23
].
In Oregon, the
“
Green Light Commercial Vehicle Operations (CVO)
”
The Pre-Pass system is a transponder-based electronic system that enables
enrolled trucks to bypass weigh stations that have been retro
tted with Pre-Pass
infrastructure: provided to the states free of charge but paid for by participating
motor carriers who fund the system with monthly service charges. In 2011, the Pre-
Pass system handled approximately 50 million trucks for an aggregate saving of
over 4 million hours and over $433 million (
http://www.prepass.com
)
.
16.11.2 Integrated Corridor Management (ICM)/Active
Traffic Management (ATDM)
Integrated Coordinated Management (ICM) of traf
c controls, lane assignments,
traveler information, comprises a series of strategies (e.g., traf
c
management centers, managed lanes, rapid incident response) to dynamically
manage roadways and corridors in response to recurring and non-recurring sources
of congestion.
c sensors, traf
ICM is a relatively new concept. The US Department of Transportation has
implemented eight demonstration projects across the US.
ICM is a relatively new concept. The US Department of Transportation has
implemented eight demonstration projects across the US. An example of the
successful application of this approach has been achieved in the metropolitan
areas of Dallas (Route 75), Alameda and Contra Costa Counties in northern
California (I-80), San Diego (I15), and Seattle (I-5) [
31
].
